| Author |
Message |
    
Keithinatlanta
Advanced Member
Username: Keithinatlanta
Post Number: 610
Registered: 3-2003
| | Posted on Sunday, June 12, 2005 - 8:33 pm: | 
|
Hi guys. From my post about horizontal beam antenna, Lon had posted about the Maco M 103 Beam. In the info part it talks about Gamma Match. I have read the terminology for years, but never knew what it means. So how about some more eudcation here.
What does Gamma match mean? Thank you!!
Keith in Atlanta |
Bruce
Senior Member
Username: Bruce
Post Number: 2853
Registered: 9-2003
| | Posted on Sunday, June 12, 2005 - 9:52 pm: |
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http://www.w8ji.com/omega_and_gama_matching.htm |
Tech291
Moderator
Username: Tech291
Post Number: 196
Registered: 11-2004
| | Posted on Monday, June 13, 2005 - 7:05 pm: |
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ZOOOOMMMMMMMMMMMMMMMMM!!!!!!!!!,
seen that one go right over Keiths' head
only kidding Keith
simply put,a gamma is the easiest way to match the coax impeadance to the antenna.
tech291
CEF#291
kc8zpj |
Pig040
Advanced Member
Username: Pig040
Post Number: 807
Registered: 7-2003
| | Posted on Tuesday, June 14, 2005 - 10:44 am: |
|
I am embarrassed to say it, but I am with Keith, I know what it does, but how does it do it? Could you do the same thing by adding length to your antenn radial, or shortening them? Is a gamma match a must on a beam?
Rich |
Tech808
Moderator
Username: Tech808
Post Number: 6082
Registered: 8-2002
| | Posted on Tuesday, June 14, 2005 - 1:29 pm: |
|
"Gamma Match"
Is a device that simplifies adjusting the antenna. The gamma match is a type of matching transformer used to match the feedpoint impedance of the antenna (which rarely is 50 Ohm) to the 50 Ohm coax. This is especially necessary on beams with more elements (more than 4) because the impedance at the feedpoint is naturally low (around 20 Ohms).
Gamma Match
Hope this help's,
Lon
Tech808
CEF808
N9OSN |
Wolverine
Intermediate Member
Username: Wolverine
Post Number: 365
Registered: 2-2003
| | Posted on Wednesday, June 15, 2005 - 4:36 am: |
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Bruce's post went way over my head too. I'm in the company of rocket scientists. thank the stars for simplicity tech 808.
wolverine. |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1982
Registered: 12-2001
| | Posted on Saturday, June 18, 2005 - 6:49 pm: |
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The gamma match is a capacitor and an inductor tap,the radiator being the inductor,you have an L/C circuit for matching the impedance of the radiator to the transmission line,simplest explanation I can give.Bigbob |
Moderator136
Moderator
Username: Moderator136
Post Number: 39
Registered: 4-2005
| | Posted on Sunday, June 19, 2005 - 3:56 am: |
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Gamma match is a capacitor that you can adjust for inpedance to match the feedpoint and coax to get the lowest swr , Ideal is 1:1 ratio.
adjust feedpoint to the low swr and you have a allmost perfect match. its about ohms and matching !
If you are talking about cb adjust the gamma match to its lowest swr on channel 20 (MID BAND)
Then you will be happy and ready to make contacts
moderator136
CEF136
kc0svc |
